<template>
   <div class="Rating-gray">
     <i v-for="(item,index) in itemClasses" :key="index" class="fa" :class="item"></i>
   </div>
</template>

<script>
const LENGTH = 5
const CLS_ON = "fa-star"
const CLS_HALF = "fa-star-half-empty"
const CLS_OF = "fa-star-0"

export default {
  name:"Rating",
  props:{
    rating:Number
  },
  computed:{
    itemClasses(){
      let result = []
      // 如 4.8 对分数进行处理, 向下取0.5的倍数
      let score = Math.floor(this.rating*2)/2
      // 用来判断哪种星星的标准
      let integer = Math.floor(score)
      let hasDecimal = score % 1 !== 0
      for (let i = 0; i < integer; i++) {
        result.push(CLS_ON)
      }
      if(hasDecimal) {
        result.push(CLS_HALF)
      }
      while(result.length < LENGTH) {
        result.push(CLS_OF)
      }
      return result
    }
  }
}
</script>

<style >
.Rating-gray {
  margin-right: 1.066667vw;
  color: #ffbe00;
  display: inline-block;
}
</style>